Hans henkik blache



H. H. BLACHE.

FUEL OIL TANK IN TWIN SCREW MOTOR SHIPS.

APPLICATION FILED AUG 2. 1919.

1 3 1 9, 947 Patented Oct. 28, 1919.

y WLMW HANS HENRIK BLAGHE, 0F HELLEBU'P, NEAR COPENHAGEN, DENMARK.

FUEL-OIL TANK IN TWIN-SCREW MOTOR-SHIPS.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed August 2, 1919. Serial No. 315,023.

To all whom it may concern:

Be it known that I, HANS HENRIK BLACHE, a citizen of the kingdom ofDenmark, residing at No. 32 Sofievej, Hellerup, near Copenhagen,Denmark, have invented certain new and useful Improvements in Fuel- OilTanks in Twin-Screw Motor-Ships, of which the following is aspecification.

In motor ships it is advisable to store a portion of the fuel oil inelevated tanks having no walls in common with the ships side, nor anywalls immediately adjacent to the ships side, as the ship may have topass through such cold climates that the cold would make it necessary toheat the oil, in order to render it sufiiciently liquid. Even when theoil is heated, it will not be suiticiently liquid, if the storage tankis partly formed by the ships side, or is placed in direct contact withthe same, as the heat supplied will then quickly be carried away by thecold water.

The present invention remedies this drawback by locating the tank, intwin-screw motor ships, between the shaft-tunnels of the twopropeller-shafts, the tank in this position being very easy toconstruct, as the side walls of the shaft-tunnels may be utilized asside walls in the tank which is closed, at top, by the same horizontalbulkhead that forms the ceiling in the shafttunnels.

The drawing illustrates one manner of constructing the invention.

Figure 1 shows, diagrammatically, the device in top-view.

Fig. 2 shows a vertical cross-section of the same.

Referring to Fig. 1, a indicates the engine-room which is closed by therear bulkhead b. a and d indicate the ships principal Diesel-engines,which drive the propeller shafts g and h. The propeller-shafts g and hare located, in usual manner, in shaft-tunnels e and 7. According tothis invention, the oil-tank or tanks are located between theshaft-tunnels, so that the oil in the tank or tanks will be protectedagainst transmission of heat to the sea. According to the invention, theoil tank is built in such a manner that the side walls of theshaft-tunnels form the side walls of the oil-tank, while the samehorizontal plates which form the ceiling and floor in the shaft-tunnelswill also form the top and bottom of the oil-tank.

In the construction shown, the oil tank is limited fore and aft by twowalls 2' and is placed transversely in relation to the ship, the wall 2'being placed at some distance from the aft bulkhead b in theengine-room, while the wall 70 is located at some suitable distance fromthe next trans verse bulkhead m, so that there are formed passages 0 and02 between the shaft-tunnels, and so that the further advantage isattained that the oil-tank is insulated, by means of these passages,from the surrounding fore-and-aft and athwart-ships bulkheads.

The tank, which is surrounded on all four sides by free assages, iseminently suitable for storage 0 oil, and it is especially easy to heatthe oil in the tank, as the heat-transmission to the surroundings isexceedingly slight. The heating of oil may be effected in ordinary knownmanner, by means of steam-coils or the like built into the tank.

I claim as my invention:

1. In a twin-screw ship, the combination, with a pair of propellershafts and a tunnel for each shaft, said tunnels being spaced from eachother and from the adjacent sides of the hull; of a fuel tank disposedin the space between the shaft-tunnels so as to be insulated by saidtunnels against temperature changes in the sea water and also againstappreciable loss of heat by heat transmission when the fuel is heated inthe tank, substantially as described.

2. In a twin-screw ship, the combination, with a pair of propellershafts and a tunnel for each shaft, said tunnels being spaced from eachother and from the adjacent sides of the hull; of a fuel tank disposedin the space between the shaft-tunnels, and connecting passages betweenthe tunnels disposed at opposite ends of the tank, whereby the tank issurrounded on all four sides by free air passages which insulate againsttemperature changes in the sea water and which enable the fuel in thetank to be heated without appreciable loss of heat by heat transmisslon.

In testimony whereof I aflix my signature.

HANS HENRIK BLACI-IE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. 0.

